package UDPEcho;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.SocketException;

public class UDPEchoSever2 {
    private DatagramSocket socket = null;

    public UDPEchoSever2(int port) throws SocketException {
        socket = new DatagramSocket(port);
    }

    public void start() throws IOException {
        System.out.println("服务器启动！");
          while(true){
              //读取请求并解析
              DatagramPacket requestPacket = new DatagramPacket(new byte[4096],4096);
              socket.receive(requestPacket);
              //根据请求返回响应
              String request = new String(requestPacket.getData(),0,requestPacket.getLength());
              String response = process(request);
              //将响应返回给服务器
              DatagramPacket responsePacket = new DatagramPacket(response.getBytes(),0,response.getBytes().length,requestPacket.getSocketAddress());
              socket.send(responsePacket);
              //打印日志
              System.out.printf("[%s:%d] req:%s resp:%s",requestPacket.getSocketAddress(),requestPacket.getPort(),request,response);
          }
    }

    private String process(String request) {
        return request;
    }

    public static void main(String[] args) throws IOException {
        UDPEchoSever2 udpEchoSever2 = new UDPEchoSever2(1060);
        udpEchoSever2.start();
    }
}
